Physics 2nd Q Exam Question Preview (ID: 45555)


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A construction worker pushes a wheelbarrow 5.0 m with a horizontal force of 50.0 N. How much work is done by the worker on the wheelbarrow?
a) 10J
b) 250J
c) 55J
d) 1250J

Work is done when
a) the displacement is not zero.
b) the displacement is zero.
c) force is zero
d) the force and displacement are perpendicular.

In which of the following scenarios is NO net work done?
a) A car accelerates down a hill.
b) A car travels at constant speed on a flat road.
c) A car decelerates on a flat road.
d) A car decelerates as it travels up a hill.

A child pulls a balloon for 12 m with a force of 1.0 N at an angle 60° below horizontal. How much work does the child do on the balloon?
a) 10J
b) 12J
c) 6.0J
d) 45J

A 70.0kg man bungee jumps off a bridge, and the bungee cord stretches 29.0m. If the spring constant of the bungee cord is 71.8N/m, what is the elastic potential energy of the jumper?
a) 1.99x10^4J
b) 1040J
c) 3.02x10^4J
d) 254J

Which of the following energy forms is associated with an object in motion?
a) potential energy
b) elastic energy
c) nonmechanical energy
d) Kinetic energy

What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s?
a) 108J
b) 54.0J
c) 87.0J
d) 216J

If friction is the only force acting on an object during a given physical process, which of the following assumptions can be made in regard to the object’s kinetic energy?
a) kinetic energy decreases
b) The kinetic energy increases.
c) The kinetic energy remains constant.
d) The kinetic energy decreases and then increases.

What is the potential energy of a 2.6 kg mass 3.5 m above the ground?
a) 16J
b) 89J
c) 9.1J
d) 0.93J

Which of the following is a true statement about the conservation of energy?
a) kinetic energy is conserved
b) gravitational potential energy is conserved
c) elastic potential is conserved
d) Total energy is always conserved.

Which of the following is the rate at which work is done?
a) potential energy
b) power
c) kinetic energy
d) mechanical energy

What is the average power supplied by a person with a weight of 590 N who is running up a flight of stairs a vertical distance of 4.0 m in 4.2 s?
a) 57W
b) 560W
c) 240W
d) 670W

A more powerful motor can do (think of definition of work)
a) more work in a longer time interval.
b) less work in a longer time interval.
c) the same work in a shorter time interval.
d) the same work in a longer time interval.

Energy that is stored due to an object's position above the ground is known as
a) gravitational potential energy
b) kinetic energy
c) elastic potential energy
d) mechanical energy

Unit for energy is the
a) J (joule)
b) W (watt)
c) kg*m/s
d) P (power)

An apple would have the highest gravitational potential energy when it was
a) right before hitting the ground during a fall
b) halfway through a fall
c) when it is sitting on the ground
d) when it is at its highest point above the ground

The unit for work is
a) J Joule
b) W watt
c) m meter
d) N newton

Gravitational force vectors are in which direction in a Free body diagram?
a) Up
b) right
c) Down
d) left

Mechanical energy is
a) only kinetic energy in a system
b) The total kinetic and potential energy in a system
c) only potential energy in a system
d) its own type of energy

If the mechanical energy in a system is 100J and the potential energy is 20J, how much kinetic energy is in the system?
a) 80J
b) 120J
c) 20J
d) 100J

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